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td7500 calibrator for process signals 用于热工仪表与过程信号计量校准的手持式仪器，准确度为 0.05 级
电量输出/测量：直流电压、直流电流、电阻、脉冲信号
支持多种类型热电阻( rtd )的模拟和测量，支持四线电阻测量模式
支持多种类型热电偶( tc )的模拟和测量，具有自动温度补偿，无须外接补偿元件
overview
model td7500, a handheld calibrator for thermal meters and process signals. the accuracy class is 0.05, it can calibrate the thermal process instruments such as industrial sensors, transmitters and recorders with class 0.1 and below.
meet the requirement of jjf 1472-2014 calibration specification for process calibrators. (tunkia is involved in drafting)
functions
● support output or measurement of following electrical parameters: dc voltage, dc current, resistance, pulse signal, etc.
● support equivalent simulation and measurement of various thermal resistances (rtd), 4-wire resistance measurement mode.
● support equivalent simulation and measurement of various thermocouples (tc), and automatic temperature compensation without external compensating elements.
● the equivalent output or measurement values of rtd and tc can be displayed in the form of electrical parameter or temperature.
● provide dc voltage of 24 v as auxiliary power supply for transmitters (loop mode).
features
● the output and measurement can be performed simultaneously, the information of source and meter are displayed separately, and any channel can be closed off at any time.
● good electrical isolation between the channels to ensure the accuracy for a long time.
● highlighted, clear and energy-efficient oled display.
● complete electrical protection such as electrostatic protection and instantaneous overload protection of voltage and current, can adapt to complex industrial applications.
● it can be used as a thermometer to display the temperature of the current environment.
electrical specifications
dc voltage and current output
output characteristics
● output range of voltage: 10 mv to 11 v
● output range of current: 0.2 ma to 24 ma
● display: 5 digits
dc voltage and current measurement
measurement characteristics
● measuring range of voltage: 10 mv to 11 v
● measuring range of current: 0.2 ma to 24 ma
● display: 5 digits
dc resistance output and measurement
output and measurement characteristics
● output range of resistance: 4 ω to 4.8 kω
● measuring range of resistance: 4 ω to 4.4 kω
● display: 5 digits
● measurement mode: 2-wire or 4-wire
frequency signal output and measurement
output and measurement characteristics
● output waveform signal: square signal of 5 vpk
● input waveform signal: square signal of 1 vpk and above
rtd output and measurement
output and measurement characteristics
● cold junction compensation: the range is from -25 °c to +55 °c, the resolution is 0.1 °c, and the accuracy is ±0.3 °c.
● display: it can be displayed and output in the form of ω, °c and °f with 5 digits.
tc output and measurement
output and measurement characteristics
● display: it can be displayed and output in the form of ω, °c and °f with 5 digits.
general specifications
● supply power: 4 ×1.5 v aa battery
● operating environment: -20 °c to +55 °c, 20 % to 85 % r·h, non-condensing
● storage environment: -20 °c to +70 °c, <95 % r·h, non-condensing
● dimensions (w × d × t): 190 mm × 100 mm × 40 mm
● weight: 0.5 kg